diff --git a/lib/web/auth/ldap/index.js b/lib/web/auth/ldap/index.js
index 77790db3..1c24fd52 100644
--- a/lib/web/auth/ldap/index.js
+++ b/lib/web/auth/ldap/index.js
@@ -10,7 +10,7 @@ const { setReturnToFromReferer } = require('../utils')
 const { urlencodedParser } = require('../../utils')
 const response = require('../../../response')
 
-let ldapAuth = module.exports = Router()
+const ldapAuth = module.exports = Router()
 
 passport.use(new LDAPStrategy({
   server: {